# std::pmr::polymorphic_allocator<T>::deallocate_object

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< cpp‎ | memory‎ | polymorphic allocator

template< class U > void deallocate_object( U* p, std::size_t n = 1 ); |  | (since C++20)

Deallocates the storage pointed to by p, which must have been allocated from a std::pmr::memory_resource x that compares equal to *resource(), using x.allocate(n * sizeof(U), alignof(U)), typically through a call to allocate_object<U>(n).

Equivalent to deallocate_bytes(p, n * sizeof(U), alignof(U));.

### Parameters

p | - | pointer to memory to deallocate
n | - | number of objects of type U the memory was for

### Exceptions

Throws nothing.

### Notes

This function was introduced for use with the fully-specialized allocator std::pmr::polymorphic_allocator<>, but it may be useful in any specialization.

### See also

deallocate_bytes (C++20) | free raw memory obtained from `allocate_bytes` (public member function)
delete_object (C++20) | destroys and deallocates an object (public member function)
deallocate [static] | deallocates storage using the allocator (public static member function of `std::allocator_traits<Alloc>`)
deallocate | deallocates memory (public member function of `std::pmr::memory_resource`)

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